Making Pine Sap Glue: Primitive Pathways Good step by step demonstration of making pitch glue and how to use it.
How to Make Pine Pitch Glue: RewildUniversity: A well-done video with another perspective.
Purifying Pine Pitch: PinewoodCH: OK video- but a unique technique. He uses modern means to do this, but I've made a little pottery sieve that could probably used for this purpose and might be very useful if your pitch has a lot of debris. I would probably also try something beside burning on top. I'll try this and share the results!
Pitch Stick the Original Hot Melt Glue: Practical Primitive Great article with step by step process of making pitch sticks.